Method and device for compensating for a transmission torque of a separating or hybrid clutch of a hybrid drive

Abstract

The invention relates to a method and to a device for compensating for a transmission torque (M*) of a clutch (4) between a controlled driving motor (3), particularly an electric machine, and an internal combustion engine (2) of a hybrid drive (1) during the transition from an exclusive operation with the driving motor (3) to a hybrid operation, wherein during the hybrid operation a total torque is provided together with the driving motor (3) and the internal combustion engine (2), wherein the rotational speed (omega) of the driving motor (3) is controlled or regulated with the help of a controlled variable (MSTELL). In order to perform the transition, the internal combustion engine (2) is tow-started by coupling with the driving motor (3) via a proportional clutch (4) with controllable transmission torque (M*). It is provided that the control or regulation of the rotational speed (omega) of the driving motor (3) occurs as a function of a target transmission torque (M*SOLL) by which the driving motor (3) is to be coupled to the internal combustion engine (2).

Description

technical field [0001] The invention relates to a method and a device according to the preamble of claim 1 or 8 . Background technique [0002] A hybrid drive of a motor vehicle usually comprises an internal combustion engine and at least one drive motor in the form of an electric motor, so that the motor vehicle can optionally be driven exclusively by the electric motor in purely electric operation, in pure engine operation by the internal combustion engine or in hybrid operation not only It is driven by the electric machine and by the internal combustion engine. [0003] In order to start the internal combustion engine with the aid of the electric machine when switching from purely electric operation to hybrid operation, hybrid vehicles are usually equipped with a so-called splitter between the electric machine and the internal combustion engine. A clutch or a hybrid clutch which, when engaged, connects the output shaft of the electric machine and the output shaft of the ...

AI Technical Summary

Problems solved by technology

Since the build-up of the actual transmission torque in the separating clutch or mixing clutch generally takes place in the form of a ramp, a "traction offset" occurs, ie a corresponding feedback between the actual transmission torque fed back and in the electric machine There is a time lag between the establishment of the actual torque of the engine, which will also cause speed disturbances or shocks when the engine is started

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